You have options. You can request a 7 day extension if you think that's enough time to hit 50. You can also simply resign now which preserves your eligibility in the future.
Your evaluation is tomorrow and you are eligible for the automatic one-day extension, so you still have 8 days to meet 50 if you think you can do it. Just post back here and let me know you wish to exercise that option.
If you don't, in 2 days you will be evaluated and treated as though you resigned at that time. (Or, you can just resign early.)
That'd be nice of you, 7 days should be more than enough to make up the posts I have remaining without having to spam up the boards. Cheers mate!